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Software: Use hardware-verified numbers for RGB->YUV conversion

This commit is contained in:
Pokechu22 2022-02-22 20:40:07 -08:00
parent e7339d63f1
commit 2f43889141
1 changed files with 8 additions and 3 deletions
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11
Source/Core/VideoBackends/Software/EfbInterface.cpp
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@ -535,9 +535,14 @@ static yuv444 ConvertColorToYUV(u32 color)
// GameCube/Wii uses the BT.601 standard algorithm for converting to YCbCr; see
// http://www.equasys.de/colorconversion.html#YCbCr-RGBColorFormatConversion
return {static_cast<u8>(0.257f * red + 0.504f * green + 0.098f * blue),
static_cast<s8>(-0.148f * red + -0.291f * green + 0.439f * blue),
static_cast<s8>(0.439f * red + -0.368f * green + -0.071f * blue)};
// These numbers were determined by hardware testing
const u16 y = +66 * red + 129 * green + +25 * blue;
const s16 u = -38 * red + -74 * green + 112 * blue;
const s16 v = 112 * red + -94 * green + -18 * blue;
const u8 y_round = static_cast<u8>((y >> 8) + ((y >> 7) & 1));
const s8 u_round = static_cast<s8>((u >> 8) + ((u >> 7) & 1));
const s8 v_round = static_cast<s8>((v >> 8) + ((v >> 7) & 1));
return {y_round, u_round, v_round};
}
u32 GetDepth(u16 x, u16 y)